Trimming mechanism for sewing-machines.



R. G. WOODWARD.

TRIMMING M HANISM FOR SEWING MACHINES.

APPLIOATION FILED FEB. 24, 1905- 909,84=O. Patented Jan. 12. 1909. 3 SHEETS-SHEET 1.

WITNESSES:- W Xi W R. G. WOODWARD.

TRIMMING MECHANISM FOR SEWING MACHINES.

APPLIOATION FILED rm. 24, 1905.

v909,840, Patented J an 12, 1909.

s snmsi-sanm 2.

Al/omey APPLIOATION FILED T13R24, 1905.

Patented Jan. 12, 1909.

3 SHEETS-SHEET 3.

Wznwzsms; @M M K A/fomey K/WWVQ UNITED STATES PATENT OFFICE.-

Y classemployed for trimming or cutting fabric on sewing machines, and has for its trimmer that will exercise a direct shear cut RUss iL- o. \voonwiinn, or [Jl 1') ILLINOIS, assicxon MACHINE couPAivY, or CHICAGO, tLixois,

TRIMMING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Jan. 12, 1909.

.To all whom it may concern:

Be it known that I, Russet. G. VVooo warm, a citizen of the United States, residingfat Waukegan, in the county of Lake, State of Illinois, have invented certain new and useful Improvements in Trimming Mechanism for Sewing-Machines, of which the following is a description, reference bemg had to the accompanying drawing and to the letters and figures of reference marked thereon. I I

Ibis invention relates to devices of that )rinci al ob'ect to )rovide a novel form of 1 j P 1 on the fabric at a point close to the line of stitching and opposite the needle, enabling it to trim seams onsharp curves without cutting into the line of sewing; a further ,object in this connection being to hold the movable shear member or blade laterally against the stationary member, so that the operation will be rendered effective and certain.

A still further object of the invention is to provide a device of this character that may be very quickly and readily adjusted to inoperative position when not required, it

eing merely necessary to change the position of the movable blade while the stationary blade at the throat plate remains in position without interfering with the ordinary operation of the machine. 7

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain features of construction and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form,

proportions, size and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings F igure 1 is a rear elevation of a sewingmachine I provided with a' trimmer constructed in accordance with the invention; Fig. 2 is a transverse sectional view of the same onthe line 2-2 ofFig. 1; Fig. 3 is a detail per- I spective View illustrating the principal members of; the trimming mechanism, detached;

Fig. l is a similar view of the auxiliary frame or bracket; F ig. 5 is a perspective view of the ad ustable springrcst; and Fig.

6 is a detail view of the lockingjdevice fol holding the cutter in inoperative position.

Similar numerals of reference are .employed td indicate corresponding parts throughout the several figures of the'drawings. I

Thegoose neck a is provided with rearwardly extending brackets for the reception of a horizontally disposed shaft 10 that is provided at one end with a rocker arm 11, connected by a link 12 to an eccentric strap that is operated by an eccentric 13 on the main shaft. At the opposite end of the shaft 10 is a rocker arm 14, through which movement is imparted in the manner hereinafter described to the trimming mechauism forming the subject of thepreseut invention.

To the under side of the head is secured a small auxiliary frame or bracket 15, which may in practice constitute an integral part of said frame, and the rear end of this auxiliary frame is preferably connected by a brace 16 to the goose neck. Y The auxiliary frame provided with bearings for the reception of a short horizontal shaft 17 on which is pivotally mounted an arm 18, and said arm carries at its front end a cutting blade 19 in the form of a thin metallic strip, the lower edge of which is sharpened to form a cutter and co-acts with a stationary blade 20 at the throat plate to effect the trimming operation. The cutting edge does not extend for thefull width of the lower end of the strip '19, a portion ofthis being, extended downwardin the form of a finger 21 which plays against the innerface of'the stationary cutter, and forms a guide for the said mogable blade, soithat the cutting edge of the latter may rais'ejt'o an extent sufficient to permit the entrance of the fabric be-' tween the two. The shaft/'17 further forms a pivot for the lower end of an an 'ularly bent lever 23, the upper end of which is connected by a link24 to the rockerarm' lai. and bearing against thelever 23 is a spring- 25, the opposite end of which bears'ag'ainst an adjustable stop 26 that may be moved for the purpose of adjusting the stress of the spring. The link 24 is of such construction' as to permit some lateral movement ofzi tween the levers 18 and 23, so that the'n1ove "ment' of the upper rock shaft will be the lever of bar 23 under pressure of the spring. This spring serves to force the lever 18in the direction of the needle bar and prcsser bar, and to hold the upper cutting blade 19 firmly against the cutting blade 20, thus insuring positive 'cuttingaction without regard to the thickness of thefabrie. Pivoted to the lever 23 is an arm orlink 28,

the lower end of which has a recess-for the reception of the shank portion of a screw-29 that is-preferablyprovlded with a milled or knurled knob for convenience in loosening or tightening the same. This screw is carried by thelever 18, and when entered in the recess of the link 28', forms a connection be* transmitted to the blade *carrying lever, and

the'latter will be reciprocated practically in a vertical plane.

Secured to the inner face of the auxiliary frame is a spring tongue 30, having a projecting rib 31, WhlCh may enter a recess '32 formed in one face of theknife-carrying lever 18 when the latter has been moved into inoperative position.

- In the operation of the device, movement *istransmitted from' the main shaft tothe rock shaft '10, and fromthence through the rock'erar'm let and link 24 to lever 23. Movement from the lever 23 is transmitted through the link 28 to the lever 18, and the latter is jreciprocated to efiect the I proper movement of the cutting blade 19.

When the trimmer is not required, the

screw 29 is loosened, and link 28 is thrown back a trifle, after which the front end of the lever l8 is thrown up,so that, the upper knife will be'ou't of the way, the locking lever or projection'fil entering the recess '32 andmaintaining the blade carrying lever 1 in its elevated inoperative position;

Having thus described my invention, what I claim as new and desire to secure by Let- I ters Patent, isi I r .7, s

1. In a trlmmlng device, a supportlng frame, ashaftljournaled'therein, aswinginglever fulcrumed on the shaft, means for;

" operating, said lever, a knife-carrying arm;

fulcrumed on the same shaft, and, means for,

connecting and disconnecting the lever and- "a-Iin; substantially as descr bed.

2; In a trimmi g dev1ce,,a supporting frame, a shaft-journaledtherein, an angular, swinging lever' jfiulcrt med on the shaft and ].Lmeans for operating the same, a knife carry-V "Hing arm'also fulcrumedfpn the shaft,, a knife connected directly theretov .anda ,link for Iconnecting' thelever and arm, substantially In'a device of theclass described, a stationary blade, a mova-bfleblade, .a loosely as describ ed,

mounted laterally moving spring pressed,

v lever; carrying the movable blade, a, second '65Y1oosely mounted laterally mov ngtleveriand inoperativ position, said means for operating it, and a link connecting the operating lever to the blade carrying lever; substantially as described.

4. In a device of the class described, a stationaryv blade, a movable blade, a loosely mounted -spring-pressed levervcarrying said movable'blade, an operating lever, and a link, pivoted to'the operating lever and detachably connected with the other lever; substantially as described. a

5'. Ina device of the class described, astutionai y blade, a movable blade,,a bracket, a

lever pivotally secured on the bracket, and a cooperating yieldin'gly supported rib or'projection ,andirecessloeated respectively on the bracket-antlqlever for holding said lever in the movable blade, p 6. In adevice oftheclass described,i-a sta tionary blade, .a gmovable blade, a loosely mounted lever; carrying said movable blade and tending-ateforcesaid lever and arm in the direction of the stationary blade; substantially as described.

8. The combination with a stationary blade, of a movable blade, a pivot shaft, a

frame carrying the same, a lever and a knife-carrying arm fulcrumed on the shaft, a detachable linkconnection between the arm and lever, means for operating the lever, a spring bearing at one end against- .the lever, and. an adjustable stop for the opositeend of said-s rin 87 substantially as described.

,9. The combination with a stationary blade, amovable blade, a' pivot shaft, a framexcarryingthe same, a lever and a knife carrying arm fU1C I'IID1GCl OD. the pivot shaft, "a'rdetachable link iconnection between the --.a'rin1- and lever, means for operating the 'lever, a spring bearing atone end against the-lever, and an adjustable stop for the opposite end of said spring, said detachable link connection including a proj ectlon on the knife carrying arm and a recess in the link to engage the prqection, substantially as wdeseribed. p p v. I

10. The .-comb1nation with a frame or bracket, of a shaft supported therein, a stationary blade, a movable blade, an arm pivoted on the shaft-and carrying'the'movable lever supporting blade, a lever also fulcrumed' on the shaft and connected to the arm, a spring surrounding the shaft and bearing against said lever to hold the blades in contact, a rock shaft, a pair of rocker arms thereon, a link connecting one of the arms to the lever and arranged to permit lateral movement of the latter and means for. transmitting movement to the second rocker arm, substantially as described.

11. The combination with a frame or bracket, of a shaft having spaced supports therein, a hanger connecting the frame to the main frame or gooseneck, a stationary blade adjacent to the needle, a movable blade, an arm pivoted on the shaft and carrying the movable blade, a lever also fulcrumed on the shaft and connected to the arm, a spring surrounding the shaft and bearing against said lever to hold the blades in contact, a rock shaft, a pair of rocker arms thereon, a link connecting one of the 'arms to the lever and arranged to permit RUSSEL G. WOODlVARD.

Witnesses CHESTER MONEIL, MAY FORBES, 

